1 files changed, 76 insertions, 0 deletions
diff --git a/ghc/compiler/abstractSyn/HsLit.lhs b/ghc/compiler/abstractSyn/HsLit.lhs
new file mode 100644
index 0000000000..bf5ae19d0b
--- /dev/null
+++ b/ghc/compiler/abstractSyn/HsLit.lhs
@@ -0,0 +1,76 @@
+%
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1994
+%
+\section[HsLit]{Abstract syntax: source-language literals}
+
+\begin{code}
+#include "HsVersions.h"
+
+module HsLit where
+
+import AbsPrel		( PrimKind )
+import Outputable
+import Pretty
+import Util
+\end{code}
+
+\begin{code}
+data Literal
+  = CharLit	    Char	-- characters
+  | CharPrimLit	    Char	-- unboxed char literals
+  | StringLit	    FAST_STRING	-- strings
+  | StringPrimLit   FAST_STRING	-- packed string
+
+  | IntLit	    Integer	-- integer-looking literals
+  | FracLit	    Rational	-- frac-looking literals
+	-- Up through dict-simplification, IntLit and FracLit simply
+	-- mean the literal was integral- or fractional-looking; i.e.,
+	-- whether it had an explicit decimal-point in it.  *After*
+	-- dict-simplification, they mean (boxed) "Integer" and
+	-- "Rational" [Ratio Integer], respectively.
+
+	-- Dict-simplification tries to replace such lits w/ more
+	-- specific ones, using the unboxed variants that follow...
+  | LitLitLitIn	    FAST_STRING	-- to pass ``literal literals'' through to C
+				-- also: "overloaded" type; but
+				-- must resolve to boxed-primitive!
+				-- (WDP 94/10)
+  | LitLitLit	    FAST_STRING
+		    UniType	-- and now we know the type
+				-- Must be a boxed-primitive type
+
+  | IntPrimLit	    Integer	-- unboxed Int literals
+#if __GLASGOW_HASKELL__ <= 22
+  | FloatPrimLit    Double	-- unboxed Float literals
+  | DoublePrimLit   Double	-- unboxed Double literals
+#else
+  | FloatPrimLit    Rational	-- unboxed Float literals
+  | DoublePrimLit   Rational	-- unboxed Double literals
+#endif
+\end{code}
+
+\begin{code}
+negLiteral (IntLit  i) = IntLit  (-i)
+negLiteral (FracLit f) = FracLit (-f)
+\end{code}
+
+\begin{code}
+instance Outputable Literal where
+    ppr sty (CharLit c)		= ppStr (show c)
+    ppr sty (CharPrimLit c)	= ppBeside (ppStr (show c)) (ppChar '#')
+    ppr sty (StringLit s)	= ppStr (show s)
+    ppr sty (StringPrimLit s)	= ppBeside (ppStr (show s)) (ppChar '#')
+    ppr sty (IntLit i)		= ppInteger i
+#if __GLASGOW_HASKELL__ <= 22
+    ppr sty (FracLit f)		= ppDouble (fromRational f) -- ToDo: better??
+    ppr sty (FloatPrimLit f)	= ppBeside (ppDouble f) (ppChar '#')
+    ppr sty (DoublePrimLit d)	= ppBeside (ppDouble d) (ppStr "##")
+#else
+    ppr sty (FracLit f)		= ppRational f
+    ppr sty (FloatPrimLit f)	= ppBeside (ppRational f) (ppChar '#')
+    ppr sty (DoublePrimLit d)	= ppBeside (ppRational d) (ppStr "##")
+#endif
+    ppr sty (IntPrimLit i)	= ppBeside (ppInteger i) (ppChar '#')
+    ppr sty (LitLitLitIn s)	= ppBesides [ppStr "``", ppPStr s, ppStr "''"]
+    ppr sty (LitLitLit s k)	= ppBesides [ppStr "``", ppPStr s, ppStr "''"]
+\end{code}